1834 - Thomas Davenport of Vermont developed the first real electric motor ('real' meaning powerful enough to do a task) although Joseph Henry and Michael Faraday created early motion devices using electromagnetic fields.
Below is a more detailed usage of operating systems according to age group: 18 to 34 years old. Of all the smartphone users, 50% use Android as operating system, 43% use iPhone, 39% use Microsoft and 38% use RIM. Apparently, more users prefer Android.
Both independent system operatorsâ units have an average age of 37 years, well above the national average of 32 years. Other oil units, which largely include combustion turbine and internal-combustion peaking technologies, have just met the average retirement age since 1999 of 32 years.